5 Must-Have Features in a fiber optic intrusion detection system

What is Liminal-F? 

First things first. 

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The principle on which this advanced perimeter intrusion detection system is based is the interference of light signals travelling through the optical fibres. These fibres can be conveniently laid over a wall, a fence, or even under the ground. 

Whats more? 

The functionality of these optical fibres remains unaffected even on being exposed to sunlight, high temperatures, rain, moisture, and/or dust making it environmentally robust. 

Now that we have the basics in place, let us move forth to understanding the technical aspect. FO-PIDS are electrically passive sensors as they carry no electrical current and are therefore immune to any kind of Electromagnetic Interference (EMI) and Radio Frequency Interference (RFI). 

Primarily, FO-PIDS uses optical fiber as the sensing element through which an optical beam is sent. An intelligent signal processing algorithm combined with powerful electronics helps detect any disturbances in the optical beam caused as a result of attempted intrusion in the form of cutting, climbing, overcoming through a tunnel underneath or a step ladder over the fence. 

The system ensures that intrusion alarms and warnings are generated to alert the authorities concerned regarding the occurrence of intrusion attempts and their location in the relevant protected area.

Let us take a closer look at this new-age Perimeter Intrusion Detection System and what it has to offer! 

Intrusion Detection Capability of Liminal-F

The Liminal-F Fibre Optic based Perimeter Intrusion Detection System is meticulously designed in a way that it can detect almost every possible attempt of intrusion, including but not limited to

• Physically climbing the fence, post of the fence or the wall
• Climbing the fence/post of the fence or the wall using a step ladder
• Tearing down or cutting the fence
• Disassembling the Fence or the alarm host 
• Digging a tunnel beneath the fence/wall 
• Cutting the Fibre itself

In fact, it can also detect and signal external activities near the fence such as running, brisk walking, vehicle passing or tree cutting.

Features of Liminal-F

Swift Detection

The Liminal-F Fibre Optic based Perimeter Intrusion Detection System senses the vibration transferred to the fibre by changes in motion and/or pressure in the vicinity. These changes are received and processed by the intelligent algorithms inside the device along with management software. A noteworthy aspect here is that a single mode fibre is used in the Liminal-F system for communication as well as detection.

Zone Based Distributed Sensor System

For deployment, the perimeter can be segregated into manageable zone lengths of up to 1,500 metres. Up to 16 zones can be monitored through a single hardware device and can be managed by a single instance of management software

Dry Contact Alarm Output (NO/NC)

The system is equipped with NO/NC dry contacts which enable a wide range of security equipment to link up with the system. It can also be connected to external alarm units or surveillance mechanisms. Upon detecting a TAMPER or INTRUDER signal, the Liminal-F communication and monitoring unit will exercise the NO/ NC contacts to perform their respective tasks. 

Sustainable and Cost Effective

Liminal-F Intrusion Detection System is designed using a passive sensor system that does not require a power supply in the deployed field, making it both environmentally sustainable and truly cost-effective to operate.

Applications of Liminal-F

Liminal-F Fibre Optic based Perimeter Intrusion Detection System as the name suggests is used for surveillance of areas where critical monitoring of security is required. These areas include  

• Homeland Security (HLS)
• Cross-Country Borders
• Armament Depots/Garrison 
• Airports
• Solar Parks
• Oil Refineries
• Critical Infrastructure
• Prisons
• VIP Premises
• Hotel/Resorts
• Reservoirs/Nature Parks/Wildlife Sanctuaries

Control Software Attributes of Liminal-F

Liminal-F is accompanied by system software for the device operation, zone management, alarm indication and warning system to provide a real-time alert of the intrusion attempt. The Alarm Handling software is centralized to manage multiple devices over a LAN network. Hence, you can rest assured of managing the following aspects from the comfort of a computer

• Zone Marking
• Activation And Control
• Offline Map Uploading 
• Alarm Generation (Visual and Audio)
• Alarm Log Maintenance
• Alarm Management Software Attributes

Alarm Triggers of Liminal-F

The following are the instances in which Liminal-Fs alarms get triggered  

• Intrusion 
• Fibre Break 
• Tamper 
• Power off 

Alarm Devices

Depending on your application, preferences and budget you can choose for one or more of the alarm devices that will help you stay on top of your game  

• LED/Strobe 
• Siren 
• Software Audio Visual

Liminal-F Variants

Depending on the size of the sensors and the application, Liminal-F is available in two variants  

Liminal-F DZ

Liminal-F DZ is a compact all-in-one system suitable for 2 zones. It is housed in an IP-67 grade enclosure allowing itself to be mounted directly on the fence/wall.

Liminal-F MZ

Liminal-F MZ is designed to be modular. It is a standard 19-inch 4u rack mountable version with several slots for add-on cards. One unit with 8 pairs of optical Transmitter and Receivers add-on cards can cater up to 16 zones. When the number of zones is fewer than 16, the requisite number of add-on cards need to be mounted into the enclosure.

What Do You Get? 

In addition to the FO-PIDS sensors, you will be provided with the management software for the device operation, zone management, alarm indication and warning system.

Not to mention, you can opt for the deployment of the system through the trained technicians at A-1 Fence Products. The fence can be deployed in one of the following ways, depending on the needs and preferences for your property

• On-The-Fence Deployment

• Straight Lines
• Parallel Lines
• Wave Form 

• Underground Deployment

• Loop Form
• Single Line/Double Line
• Dolphin Trail

• Over/Above/Under the Wall Deployment 

• Straight lines
• Parallel lines
• Wave form 

Final, Final Word!

We hope that you are now well aware of all the aspects of the new-age fibre-optic based intrusion detection system that Liminal-F is.

If you wish to get this robust surveillance system installed in your premises, or simply wish to have some questions answered, feel free to get in touch with our team at +91  or us at

Rest assured, you will get the best assistance and the most effective solution for your intrusion detection needs. 

Existing standard communications fiber infrastructures may be leveraged to connect a network of platforms, and multiple platforms may be leveraged to connect a network of platforms multiplexed over a single optical fiber while remaining individually addressable, simplifying the logistics and reducing the cost of installation.

The intrusion detection platform may be directly buried, providing the capability to determine the location of pedestrian and vehicle traffic intrusion events over distances of many kilometers. Intrusion event location accuracy is approximately equal to fiber optic loop length 100 for a single fiber. Accuracy improves with the use of multiple co-located fiber loops, making false alarms virtually eliminated by CEL&#;s embedded, advanced designs and configurations.

The use of fiber optic sensors as a physical security solution has multiple benefits. The key feature of FiberStrike® systems is the response time to an event which averages at 1.5 seconds. Since the sensors are passive, non-conductive, require no electrical power, and emit no signal, the connection will not be disrupted if power is cut. They cannot be bypassed without detection, and they are superior to traditional electro-mechanical sensors due to their resistance to electromagnetic and radio frequency interference, lightning, and corrosion.

The FiberStrike® LCM-940 pedestrian sensing platform uses UV light and fiber optic sensors to detect pedestrians in specific, secure locations, or restricted areas. The platform is a fiber-optic intrusion sensor system that can act as a &#;first alert&#; to trigger security cameras or alarms. The technology provides Point Detection Sensing to ascertain exact points of intrusion.

For example, fiber optic intrusion detection systems are used in railway, mass-transit, and sub-way platforms. The platform senses movements along defined paths, and intrusion detection along hallways or in front of doorways or hatches that access secure areas.

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3/27/

Many of us have fiber optic cable that delivers Internet access to our homes or offices. But optical fiber cable can be used for more than high-speed data transfer. I'm not talking about artwork or illumination but a vital security application: physical intrusion detection.

Fiber Optic Intrusion Detection & Physical Security Monitoring

Fiber Optic Intrusion Detection & Physical Security Monitoring  

LCM-940 Pedestrian Sensing Platform

For example, fiber optic intrusion detection systemfiber optic intrusion detection systems are used in railway, mass-transit, and sub-way platforms. The platform senses movements along defined paths, and intrusion detection along hallways or in front of doorways or hatches that access secure areas.

The FiberStrike® LCM-940 pedestrian sensing platform uses UV light and fiber optic sensors to detect pedestrians in specific, secure locations, or restricted areas. The platform is a fiber-optic intrusion sensor system that can act as a &#;first alert&#; to trigger security cameras or alarms. The technology provides Point Detection Sensing to ascertain exact points of intrusion.

The Benefits of Fiber Optic Intrusion Sensors

The use of fiber optic sensors as a physical security solution has multiple benefits. The key feature of FiberStrike® systems is the response time to an event which averages at 1.5 seconds. Since the sensors are passive, non-conductive, require no electrical power, and emit no signal, the connection will not be disrupted if power is cut.  They cannot be bypassed without detection, and they are superior to traditional electro-mechanical sensors due to their resistance to electromagnetic and radio frequency interference, lightning, and corrosion.

The intrusion detection platform may be directly buried, providing the capability to determine the location of pedestrian and vehicle traffic intrusion events over distances of many kilometers. Intrusion event location accuracy is approximately equal to fiber optic loop length 100 for a single fiber. Accuracy improves with the use of multiple co-located fiber loops, making false alarms virtually eliminated by CEL&#;s embedded, advanced designs and configurations.

Existing standard communications fiber infrastructures may be leveraged to connect a network of platforms, and multiple platforms may be leveraged to connect a network of platforms multiplexed over a single optical fiber while remaining individually addressable, simplifying the logistics and reducing the cost of installation.

Fiber Optics Used in Intrusion Detection

3/27/

Many of us have fiber optic cable that delivers Internet access to our homes or offices. But optical fiber cable can be used for more than high-speed data transfer. I'm not talking about artwork or illumination but a vital security application: physical intrusion detection.

To understand how this works, you need to know a little bit about fiber optic cable. There are two types of fiber: single-mode and multimode. Without getting deep into the weeds and mathematics of the transmission of light in the two types of fibers, there are some crucial differences:

• Single-mode fiber can be used in applications requiring higher speeds or longer distances.

• Single-mode fiber has a minimal diameter compared to multimode.

• Single-mode fiber is more expensive per meter, and the equipment is more expensive than that for multimode.

Single-mode and multimode fiber can each be used for intrusion detection, but the mechanisms are significantly different. Vendors who sell intrusion detection schemes based on fiber keep their exact schemes proprietary, but the concepts are similar. For example, one factor the vendors keep confidential is determining whether the intrusion was by a pedestrian or a vehicle.

The beam profile of a single-mode (left) and a multimode (right) fiber

How it works

In the case of multimode fiber, the concept is straightforward: a laser sends light through the fiber (as when the fiber is used to transmit data). The light at the receiving end forms a speckle pattern when the fiber is undisturbed. When the fiber is under pressure or significantly bent, the pattern of the light at the receiving end changes. This allows a device at the receiving end to analyze the distortion and notify a monitoring device accordingly.

In the case of single-mode fiber, things get a bit more complicated. The nature of light traveling in a single path or mode through the fiber, no pattern at the receiving end can be disturbed. Instead, one wavelength or color of light is sent through the fiber in one direction, and another wavelength of light is sent in the other direction. Pressure on the cable changes the way the cable transmits light that can be detected at the end of the cable.

(Another technique involving light pulses has been used to detect earthquakes, which is beyond the scope of security uses.)

When might it be used?

Using fiber optic cable for intrusion detection is not inexpensive, so when might it be appropriate? Significant applications are in areas where a clear view of a perimeter or internal area cannot be easily viewed directly.

Consider a facility where one or more portions of a perimeter border an area of dense vegetation such as a forest. In that case, the physical plant may want to erect a fence on that perimeter. A cable could be integrated with the fence or placed inside or outside it to detect vehicles or individuals at the fence or trying to cross it.

Inside a facility, a system might be deployed where there is little activity at a particular time of day. Specifically, a system might be used in a server room not generally occupied at night.

Rightly, organizations are often reluctant to discuss their specific security measures. That makes knowing how many and what types of fiber optic intrusion detection systems are in use. But a web search for vendors indicates that the market size is not trivial. Who knows, you or I may traverse such a system daily. But, if you do - knowingly or unknowingly - at least you know how it works.

Get wired into the latest Networking training and certification. Available In-Person, Online, or as Private Team Training!

This piece was originally posted on April 2, , and has been refreshed with updated styling.

To understand how this works, you need to know a little bit about fiber optic cable. There are two types of fiber: single-mode and multimode. Without getting deep into the weeds and mathematics of the transmission of light in the two types of fibers, there are some crucial differences:

• Single-mode fiber can be used in applications requiring higher speeds or longer distances.

• Single-mode fiber has a minimal diameter compared to multimode.

• Single-mode fiber is more expensive per meter, and the equipment is more expensive than that for multimode.

Single-mode and multimode fiber can each be used for intrusion detection, but the mechanisms are significantly different. Vendors who sell intrusion detection schemes based on fiber keep their exact schemes proprietary, but the concepts are similar. For example, one factor the vendors keep confidential is determining whether the intrusion was by a pedestrian or a vehicle.

The beam profile of a single-mode (left) and a multimode (right) fiber

How it works

In the case of multimode fiber, the concept is straightforward: a laser sends light through the fiber (as when the fiber is used to transmit data). The light at the receiving end forms a speckle pattern when the fiber is undisturbed. When the fiber is under pressure or significantly bent, the pattern of the light at the receiving end changes. This allows a device at the receiving end to analyze the distortion and notify a monitoring device accordingly.

In the case of single-mode fiber, things get a bit more complicated. The nature of light traveling in a single path or mode through the fiber, no pattern at the receiving end can be disturbed. Instead, one wavelength or color of light is sent through the fiber in one direction, and another wavelength of light is sent in the other direction. Pressure on the cable changes the way the cable transmits light that can be detected at the end of the cable.

(Another technique involving light pulses has been used to detect earthquakes, which is beyond the scope of security uses.)

When might it be used?

Using fiber optic cable for intrusion detection is not inexpensive, so when might it be appropriate? Significant applications are in areas where a clear view of a perimeter or internal area cannot be easily viewed directly.

Consider a facility where one or more portions of a perimeter border an area of dense vegetation such as a forest. In that case, the physical plant may want to erect a fence on that perimeter. A cable could be integrated with the fence or placed inside or outside it to detect vehicles or individuals at the fence or trying to cross it.

Inside a facility, a system might be deployed where there is little activity at a particular time of day. Specifically, a system might be used in a server room not generally occupied at night.

Rightly, organizations are often reluctant to discuss their specific security measures. That makes knowing how many and what types of fiber optic intrusion detection systems are in use. But a web search for vendors indicates that the market size is not trivial. Who knows, you or I may traverse such a system daily. But, if you do - knowingly or unknowingly - at least you know how it works.

Get wired into the latest Networking training and certification. Available In-Person, Online, or as Private Team Training!

This piece was originally posted on April 2, , and has been refreshed with updated styling.

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